Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 110) Show all publications
Edlund, U., Lagerberg, T. & Alander, E. (2019). Admicellar Polymerization Coating of CNF Enhances Integration in Degradable Nanocomposites. Paper presented at Symposium on Rational Design of Multifunctional Renewable-Resourced Materials held during the ACS National Meeting, AUG 19-23, 2018, Boston, MA. Biomacromolecules, 20(2), 684-692
Open this publication in new window or tab >>Admicellar Polymerization Coating of CNF Enhances Integration in Degradable Nanocomposites
2019 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 20, no 2, p. 684-692Article in journal (Refereed) Published
Abstract [en]

A water-based one-pot synthesis strategy for converting cellulose nanofibrils (CNF) into a hydrophobic and processable biopolymer grade is devised. CNF was chemically modified through admicellar polymerization, producing fibrils coated with fatty acrylate polymers. The proposed modification targets a change in the interfibrillar interactions and improved CNF compatibility with a degradable plastic composite matrix, poly(butylene adipate-co-terephthalate), PBAT in composites prepared by melt extrusion. CNF had a clear reinforcing effect on PBAT, increasing Young's modulus by at least 35% and 169% at 5 and 20% (w/w) CNF content, respectively. However, unmodified CNF showed aggregation, poor adhesion in the matrix, and severely impaired the ductility of PBAT. CNF modified by admicellar polymerization was homogeneously dispersed in the PBT matrix and showed significantly better preservation of the elongation properties compared to unmodified CNF, especially at 5% (w/w) addition level.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-245947 (URN)10.1021/acs.biomac.8b01318 (DOI)000458937200012 ()30301347 (PubMedID)2-s2.0-85055521080 (Scopus ID)
Conference
Symposium on Rational Design of Multifunctional Renewable-Resourced Materials held during the ACS National Meeting, AUG 19-23, 2018, Boston, MA
Note

QC 20190311

Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-03-11Bibliographically approved
Wahlström, N., Harrysson, H., Undeland, I. & Edlund, U. (2018). A Strategy for the Sequential Recovery of Biomacromolecules from Red Macroalgae Porphyra umbilicalis Kützing. Industrial & Engineering Chemistry Research, 57(1), 42-53
Open this publication in new window or tab >>A Strategy for the Sequential Recovery of Biomacromolecules from Red Macroalgae Porphyra umbilicalis Kützing
2018 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 57, no 1, p. 42-53Article in journal (Refereed) Published
Abstract [en]

A nondestructive, multicomponent fractionation strategy has been developed to extract proteins and polysaccharides from the red macroalgae Porphyra umbilicalis collected along the west coast of Sweden and cultivated indoors under controlled conditions. First, a protein-rich fraction was extracted in an ice-cold alkaline solution. The overall protein content in Porphyra umbilicalis was estimated to be 30.6% of the dry weight, and out of that, 15.0% could be recovered. Water-soluble polysaccharides were then extracted from the insoluble residual fraction using sequential alkaline and acidic treatments at 90 °C for 4 h. Spectroscopic and chromatographic analyses of the polysaccharide fractions show that high-molecular-weight carrageenans were obtained from the alkaline extraction and a galactose-rich pectin substance was obtained from the acidic extraction. The insoluble fraction remaining after all extraction steps was rich in cellulose. An elemental analysis of Porphyra umbilicalis via scanning electron microscopy with energy-dispersive X-ray spectrometry (SEM-EDS) showed the presence of C, O, Na, Ca, Mg, Al, Cl, and S. However, no heavy metals or other toxic elements, such as Pb, Hg, and As, were found.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-221687 (URN)10.1021/acs.iecr.7b03768 (DOI)000419999800003 ()2-s2.0-85040457542 (Scopus ID)
Note

QC 20180122

Available from: 2018-01-22 Created: 2018-01-22 Last updated: 2018-02-02Bibliographically approved
Svärd, A., Sterner, M. & Edlund, U. (2018). Bioplastics and composites from plant heteropolysaccharides. Paper presented at 255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA. Abstract of Papers of the American Chemical Society, 255
Open this publication in new window or tab >>Bioplastics and composites from plant heteropolysaccharides
2018 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 255Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-240170 (URN)000435537702808 ()
Conference
255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA
Note

QC 20190111

Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-01-11Bibliographically approved
Sterner, M. & Edlund, U. (2018). High-Performance Filaments from Fractionated Alginate by Polyvalent Cross-Linking: A Theoretical and Practical Approach. Biomacromolecules, 19(8), 3311-3330
Open this publication in new window or tab >>High-Performance Filaments from Fractionated Alginate by Polyvalent Cross-Linking: A Theoretical and Practical Approach
2018 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 19, no 8, p. 3311-3330Article in journal (Refereed) Published
Abstract [en]

A series of alginate fractions with significant differences in molecular weight and uronic acid compositions were produced by consecutive fractionation and converted to thin and strong cross-linked polymer filaments via extrusion into calcium, aluminum, or polyaluminum (PolyAl) polyvalent solutions followed by drawing and drying. Models were elaborated to relate the alginate uronic acid composition to the tensile performance in both the wet gel filament and the dry filament states. The wet gel model was compared to the theory of the unidirectional elongation of charged polyelectrolyte gels based on the classical rubber elasticity of dilated polymer networks, extended to include the contributions of non-Gaussian chain extensions and the effect of electrostatic interactions. The theory of equilibrium swelling pressure was applied to describe the observed shrinkage of the alginate gels following immersion in a polyvalent solution. Congruent with the theoretical model of charged gels, the tensile performance of the gel filaments prepared from CaCl2 depended on the compositional ratio of guluronic acid dyads in the alginate fraction multiplied by the alginate concentration, while the tensile behavior of wet gel filaments prepared by AlCl3 instead resembled that of elastic solid materials and depended only on the alginate concentration. The dry filament tensile properties were greatly dependent on the preparation conditions, particularly the ratio of stress to alginate concentration and the nature of the ions present during filament drawing. The PolyAl solution effectively caused shrinkage of alginate to a strong extent, and the resulting filaments behaved as highly stiff materials able to withstand stresses of approximately 500 MPa and having elastic moduli as high as 28 GPa.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-234196 (URN)10.1021/acs.biomac.8b00619 (DOI)000441852400015 ()29954171 (PubMedID)2-s2.0-85049409145 (Scopus ID)
Note

QC 20180911

Available from: 2018-09-11 Created: 2018-09-11 Last updated: 2018-11-20Bibliographically approved
Svärd, A., Brännvall, E. & Edlund, U. (2018). Modified and thermoplastic rapeseed straw xylan: A renewable additive in PCL biocomposites. Industrial crops and products (Print), 119, 73-82
Open this publication in new window or tab >>Modified and thermoplastic rapeseed straw xylan: A renewable additive in PCL biocomposites
2018 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 119, p. 73-82Article in journal (Refereed) Published
Abstract [en]

Xylan extracted from rapeseed straw was chemically modified to gain hydrophobic and thermoplastic properties via macroinitiator formation followed by a free radical grafting-from polymerization with octadecyl acrylate. Biocomposites were then prepared by incorporation of 5 or 20% (w/w) rapeseed straw xylan into a poly(epsilon-caprolactone) (PCL) matrix by melt extrusion. The grafted xylan was homogeneously distributed within the biocomposite and reinforced the PCL matrix while at the same time preserving the ability to elongate to tensile strains > 500%. Analogous biocomposites made from unmodified xylan in a PCL matrix resulted in heterogeneous mixtures and brittle tensile properties.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Biocomposite, Grafting, Hemicellulose, Rapeseed/canola straw, Thermoplastic, Xylan
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-227505 (URN)10.1016/j.indcrop.2018.03.067 (DOI)000432763800009 ()2-s2.0-85045072624 (Scopus ID)
Funder
Swedish Research Council Formas, 2013-844
Note

QC 20180518

Available from: 2018-05-18 Created: 2018-05-18 Last updated: 2018-09-07Bibliographically approved
Ogonowski, M., Edlund, U., Gorokhova, E., Linde, M., Ek, K., Liewenborg, B., . . . Breitholtz, M. (2018). Multi-level toxicity assessment of engineered cellulose nanofibrils in Daphnia magna. Nanotoxicology, 12(6), 509-521
Open this publication in new window or tab >>Multi-level toxicity assessment of engineered cellulose nanofibrils in Daphnia magna
Show others...
2018 (English)In: Nanotoxicology, ISSN 1743-5390, E-ISSN 1743-5404, Vol. 12, no 6, p. 509-521Article in journal (Refereed) Published
Abstract [en]

Cellulose nanofibril (CNF)-based materials are increasingly used in industrial and commercial applications. However, the impacts of CNF on aquatic life are poorly understood, and there are concerns regarding their potential toxicity. Using a combination of standard ecotoxicological tests and feeding experiments, we assessed the effects of CNF exposure (0.206-20.6 mg/L) on the feeding (food uptake and gut residence time) and life-history traits (growth and reproduction) in the cladoceran Daphnia magna. No mortality was observed in a 48 h acute exposure at 2060 mg/L. Moreover, a 21-day exposure at low food and moderate CNF levels induced a stimulatory effect on growth, likely driven by increased filtration efficiency, and, possibly, partial assimilation of the CNF by the animals. However, at low food levels and the highest CNF concentrations, growth and reproduction were negatively affected. These responses were linked to caloric restriction caused by dilution of the food source, but not an obstruction of the alimentary canal. Finally, no apparent translocation of CNF past the alimentary canal was detected. We conclude that CNF displays a low toxic potential to filter-feeding organisms and the expected environmental risks are low.

Place, publisher, year, edition, pages
Taylor & Francis, 2018
Keywords
Cellulose nanofibrils, Daphnia magna, feeding, caloric restriction, toxicity
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-240193 (URN)10.1080/17435390.2018.1464229 (DOI)000439981600002 ()29732936 (PubMedID)2-s2.0-85046465659 (Scopus ID)
Note

QC 20190111

Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-01-11Bibliographically approved
Ogonowski, M., Edlund, U., Gorokhova, E., Linde, M., Ek, K., Liewenborg, B., . . . Breitholtz, M. (2018). Multi-level toxicity assessment of engineered cellulose nanofibrils in Daphnia magna. Nanotoxicology, 12(6), 509-521
Open this publication in new window or tab >>Multi-level toxicity assessment of engineered cellulose nanofibrils in Daphnia magna
Show others...
2018 (English)In: Nanotoxicology, ISSN 1743-5390, E-ISSN 1743-5404, Vol. 12, no 6, p. 509-521Article in journal (Refereed) Published
Abstract [en]

Cellulose nanofibril (CNF)-based materials are increasingly used in industrial and commercial applications. However, the impacts of CNF on aquatic life are poorly understood, and there are concerns regarding their potential toxicity. Using a combination of standard ecotoxicological tests and feeding experiments, we assessed the effects of CNF exposure (0.206–20.6 mg/L) on the feeding (food uptake and gut residence time) and life-history traits (growth and reproduction) in the cladoceran Daphnia magna. No mortality was observed in a 48 h acute exposure at 2060 mg/L. Moreover, a 21-day exposure at low food and moderate CNF levels induced a stimulatory effect on growth, likely driven by increased filtration efficiency, and, possibly, partial assimilation of the CNF by the animals. However, at low food levels and the highest CNF concentrations, growth and reproduction were negatively affected. These responses were linked to caloric restriction caused by dilution of the food source, but not an obstruction of the alimentary canal. Finally, no apparent translocation of CNF past the alimentary canal was detected. We conclude that CNF displays a low toxic potential to filter-feeding organisms and the expected environmental risks are low. © 2018, © 2018 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

Place, publisher, year, edition, pages
Taylor and Francis Ltd, 2018
Keywords
caloric restriction, Cellulose nanofibrils, Daphnia magna, feeding, toxicity, cellulose, cellulose nanofibril, nanoparticle, unclassified drug, acute toxicity, Article, bacterial growth, body height, conductance, controlled study, digestive system, enzyme engineering, filtration, fluorescence microscopy, food availability, food intake, life history, life history trait, long term exposure, nanotechnology, nanotoxicology, nonhuman, nutritional value, oxygen saturation, pH, priority journal, suspension, Sweden
National Category
Pharmacology and Toxicology
Identifiers
urn:nbn:se:kth:diva-238096 (URN)10.1080/17435390.2018.1464229 (DOI)000439981600002 ()2-s2.0-85046465659 (Scopus ID)
Note

Export Date: 30 October 2018; Article; Correspondence Address: Ogonowski, M.; Department of Environmental Science and Analytical Chemistry, Stockholm University, Svante Arrhenius v€ag 8, Sweden; email: martin.ogonowski@aces.su.se; Funding details: 2014-151, Svenska Forskningsrådet Formas; Funding text: This project was funded by the Swedish Research Council Formas under Grant number [2014-151].

QC 20190111

Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-01-11Bibliographically approved
Choong, F. X., Back, M., Schulz, A., Nilsson, K. P., Edlund, U. & Richter-Dahlfors, A. (2018). Stereochemical identification of glucans by oligothiophenes enables cellulose anatomical mapping in plant tissues. Scientific Reports, 8, Article ID 3108.
Open this publication in new window or tab >>Stereochemical identification of glucans by oligothiophenes enables cellulose anatomical mapping in plant tissues
Show others...
2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 3108Article in journal (Refereed) Published
Abstract [en]

Efficient use of plant-derived materials requires enabling technologies for non-disruptive composition analysis. The ability to identify and spatially locate polysaccharides in native plant tissues is difficult but essential. Here, we develop an optical method for cellulose identification using the structure-responsive, heptameric oligothiophene h-FTAA as molecular fluorophore. Spectrophotometric analysis of h-FTAA interacting with closely related glucans revealed an exceptional specificity for beta-linked glucans. This optical, non-disruptive method for stereochemical differentiation of glycosidic linkages was next used for in situ composition analysis in plants. Multi-laser/multi-detector analysis developed herein revealed spatial localization of cellulose and structural cell wall features such as plasmodesmata and perforated sieve plates of the phloem. Simultaneous imaging of intrinsically fluorescent components revealed the spatial relationship between cell walls and other organelles, such as chloroplasts and lignified annular thickenings of the trachea, with precision at the sub-cellular scale. Our non-destructive method for cellulose identification lays the foundation for the emergence of anatomical maps of the chemical constituents in plant tissues. This rapid and versatile method will likely benefit the plant science research fields and may serve the biorefinery industry as reporter for feedstock optimization as well as in-line monitoring of cellulose reactions during standard operations.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP, 2018
National Category
Plant Biotechnology
Identifiers
urn:nbn:se:kth:diva-225306 (URN)10.1038/s41598-018-21466-y (DOI)000425190500012 ()29449697 (PubMedID)2-s2.0-85042212769 (Scopus ID)
Note

QC 20180404

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-05-24Bibliographically approved
Edlund, U. (2017). Biomass conversion into functional bioplastics and gels. Paper presented at 253rd National Meeting of the American-Chemical-Society (ACS) on Advanced Materials, Technologies, Systems, and Processes, APR 02-06, 2017, San Francisco, CA. Abstract of Papers of the American Chemical Society, 253
Open this publication in new window or tab >>Biomass conversion into functional bioplastics and gels
2017 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 253Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-243599 (URN)000430568503053 ()
Conference
253rd National Meeting of the American-Chemical-Society (ACS) on Advanced Materials, Technologies, Systems, and Processes, APR 02-06, 2017, San Francisco, CA
Note

QC 20190206

Available from: 2019-02-06 Created: 2019-02-06 Last updated: 2019-02-06Bibliographically approved
Svärd, A., Brännvall, E. & Edlund, U. (2017). Corrigendum to “Rapeseed straw as a renewable source of hemicelluloses: Extraction, characterization and film formation” [Carbohydrate Polymers 133 (2015) 179–186](S0144861715006529)(10.1016/j.carbpol.2015.07.023). Carbohydrate Polymers, 174, 1240
Open this publication in new window or tab >>Corrigendum to “Rapeseed straw as a renewable source of hemicelluloses: Extraction, characterization and film formation” [Carbohydrate Polymers 133 (2015) 179–186](S0144861715006529)(10.1016/j.carbpol.2015.07.023)
2017 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 174, p. 1240-Article in journal (Other academic) Published
Abstract [en]

The authors regret that the original version of this article unfortunately contained a mistake in Table 5. The correct Table 5 and associated text is given below. “The rapeseed hemicellulose films presented here had strain-at-break values of 70% (C) and 90% (H), even with no added plasticizers (Table 5).” The authors would like to apologise for any inconvenience caused.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-234655 (URN)10.1016/j.carbpol.2017.07.037 (DOI)2-s2.0-85026534602 (Scopus ID)
Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2018-12-14Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1631-1781

Search in DiVA

Show all publications